Get real. Lots of criminals have weapons that are illegal for them to have in places where guns are banned. Cops aren't doing your scenario on them.
Because it's dangerous for the cops.
/johnny
I suspect that Obama, Pelosi, Reid, and many city police chiefs are far more worried about free Americans (like you, but in liberal states and cities) than they are about real criminals. They will come for us if we give them the chance, if we don't stop them at the ballot box or otherwise first. As for real criminals, they will still get a free pass if they fit the liberal demographic.